Mixed matrix membranes (MMMs) owing to the tunable characteristics and functionalization ability can effectively substitute the highly intensive conventional membranes for industrial-scale CO₂ separation. Further, to strengthen the interfacial polymer-filler interaction, an interfacial design strategy incorporating active functional groups in the filler surface can be demonstrated. In this study, as-synthesized silica nanoparticles (SNPs) was surface functionalized by (3-aminopropyl) trimethoxysilane silica modifier (AFSNP). The CO₂ separation of poly (vinyl alcohol)/polyethylene glycol based MMM infused with surface-functionalized SNP (AFSNP) was conducted. The comparative study highlighted in-depth analysis of intrinsic physicochemical properties of as-synthesized membranes and nanoparticles. Detailed characterization such as advanced microscopic analysis, X-ray photoelectron spectroscopy (XPS) analysis and ninhydrin assay validated the successful grafting of amino groups onto the silica surface. The morphological inspection corroborated the consistent dispersion ability of the nanoparticles in the membrane matrix. The effect of the operating conditions on the membrane selectivity and CO₂ permeance were statistically analyzed by ANOVA. The CO₂ permeation result (CO₂ permeance and CO₂/N₂ selectivity) exhibited many fold increment with surface functionalization of SNPs compared to undoped silica MMM. The defect-free, performance-oriented CO₂-selective membrane thus opened up the possibility of this combination as a prospective contender for large-scale carbon capture studies.

中文翻译：

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通过加入胺官能化二氧化硅填料提高混合基质膜的 CO2 分离性能

混合基质膜（MMM）由于具有可调特性和功能化能力，可以有效地替代高强度的传统膜进行工业规模的 CO ₂分离。此外，为了加强界面聚合物-填料相互作用，可以证明在填料表面结合活性官能团的界面设计策略。在这项研究中，合成的二氧化硅纳米粒子 (SNP) 被（3-氨基丙基）三甲氧基硅烷二氧化硅改性剂（AFSNP）表面功能化。二氧化碳₂进行了注入表面功能化 SNP (AFSNP) 的基于聚（乙烯醇）/聚乙二醇的 MMM 的分离。比较研究强调了对合成膜和纳米粒子的内在物理化学特性的深入分析。高级显微分析、X 射线光电子能谱 (XPS) 分析和茚三酮测定等详细表征验证了氨基成功接枝到二氧化硅表面。形态学检查证实了纳米颗粒在膜基质中的一致分散能力。通过ANOVA对操作条件对膜选择性和CO ₂渗透率的影响进行统计分析。CO ₂渗透结果（CO ₂ permeance 和 CO₂ /N ₂选择性) 与未掺杂的二氧化硅 MMM 相比，随着 SNP 的表面功能化表现出许多倍的增量。因此，无缺陷、以性能为导向的 CO ₂选择性膜开辟了这种组合作为大规模碳捕获研究的潜在竞争者的可能性。